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Investments (Schedule of Noncontrolling Interest) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Noncontrolling Interest [Line Items] |  |  |  |
Net loss | $ 100 | $ 30 | $ 130 | $ 1,887
PST Eletronica Ltda [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling interest at beginning of period |  | $ 13,762 | 13,762 | 13,310
Net loss |  |  | (130) | (1,887)
Foreign currency translation |  |  | 826 | 2,339
Comprehensive income (loss) |  |  | 696 | 452
Acquisition of noncontrolling interest |  |  | (14,458) |
Noncontrolling interest at end of period |  |  | $ 0 | $ 13,762

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